.bird-container{
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: greenyellow;
    display:flex;
    align-items:center;
}
.bird-map{
    height: 0;
    padding-bottom: 50%;
    background: green;
    overflow: hidden;
    position: relative;
    border: solid green 1px;
}
.bird-map button{
    position: absolute;
    height: 15%;
    width: 20%;
    left: 40%;
    top: 40%;
    font-size: 4em;
    border: none;
    background: transparent;
    color: white;
    opacity: 0.6;
    outline: none;
}
.bird-map button:hover{
    opacity: 1;
}